This is a description taken from LEGO.com. Please do not modify it. (visit this item's product page)Age Mark: 8+Brick Type: LEGO® System Related Products: 9668, 9686Piece Count: 1
This Ni-MH battery with connector is designed to be combined with the 9668 Energy Display. When combined, the two elements form the LEGO Energy Meter. Storage capacity: 150 mAh.